Rotary harrow.



F. ERICKSON.

ROTARY HARROW.

APPLICATION mw oec. l. me.

Patented Apr. 2, 1918.

2 SHEETS-SHEET] STES FRITZ ERICKSON, OF PHILIPSBURG, MONTANA.

ROTARY' HARROW.

Application.filedl December 1, 1916i.

T0 all. w imm, t 'mag/'concern .1

Be it known that I, FRITZ ERIoKsoN, a citizen of the United States, residing at Philipsburg, in the county of Granite and State of Montana, have invented certain new and useful Improvements in Rotary Harrows, of which the following is av speciication.

The present invention. relates to an agricultural implement for tilling the soil and more particularly to a rotary harrow and has forits object to provide such an imple-V ment of simple construction, easy to transport to or from the placef of operation and in which the tines, spikes or blades may be easily replaced inz case of accident, or entirely removed in groups if desired. @ther advantagesand objects will be made evident from the following description..

In: the: accompanying drawings, one ein# bodiment of the invention has been. illustrated, and, v

Figure 1 isy a. sidel view partly' in. section.

of the harroiw7 inf position for transporta-tion.

Fig'. 2 is a plan view of Fig. l partly in section.

. Figi. 3 is a transverse section on. line Ill-IH ofFig.. 1 on a larger' scale. p

Fig.` l is a similar section on line lV-IV of lP ig. 1.

Fig'. 5 is a side view in larger scale of the tine or spike mounting.

Fig. (i is a vertical section of Figo.A

F ig. Tis a similar View showing the bearing for the spike shaft.

Fig. S is a perspective view of a spike carrier or sleeve.

Fig. 9 is a portion of a bearing block for the spike shafts.

Figs. 1()= and 11 are a section and elevation respectively, showing a modified form of wheel mounting, and Figs. 1d and 1b are detail views of another modified form of wheel mounting.

The frame 15 of rectangular' shape is provided with four detachable wheels 16. They are preferably carried on short stub shafts 17 having an upwardly-extending bracket portion 18 for attachment to the frame. In the bracket portion are to be found several holes intended for engagement kwith corresponding studs 19 in the frame as well as securing bolts 20. Bymeans of this arrangement it is not only possible to raise or lower the wheels to suit conditions, but also to swing them up out of the reach of the ground Specification of. Letters Patent.

Patented. Apr. 2, 1918.

Serial No. 134,487.

as indicated in dot and dash lines in Fig. 1, or to.` detach them entirely, whenthe harrow is-v in operation. ln order to secure the wheel brackets in the swing up position, pins are Iprovidedv for engaging with holes in the frame corresponding to those in the brackets.

Insteadiof swinging' the wheel bracket out of the way, I might use the modified form illustrated in Figs; 1'()r and 11, where the bracket 40 is mounted slidably inverti'cal guides 411 andheld in position. by a snap or springt bolt 42: engaging in a` corresponding hole 431 inthe frame'. To raise the wheel off the ground all that. is necessary'in this case is to draw out. the bolt 42, which will subsequently snap into the upper hole da and retain the wheelk in its upper position.

Int the form of wheel: mounting shown in F'g's.Y la and 1b, thewheel- 1.6 is supported in the usual manner upon. the stub axle` 17 carried by the bracket arm 18, the openings in the; bracket forv the reception of the fastening members 19 and QObeing'of'elonf gated shape as illustrated to permit a limitedv vertical movement of the wheels and brackets upon the frame l5 when obst-ructions or unequal heights. are' encountered` upon thev surface of the ground;

A. removable topv22V of the same shape and size as the frame is placed: upon the latter and: metal straps 28 are. provided for keeping the top in position, anda seat 24 for the driver may be carried on the top. Openings 25:-arefpreferably madein the top so that the boltsV QO'may bereached from above without removing the top.

The' harrow proper consists of' alternate rows of thin knife blades 26 and tines or spikes 27 of preferably square cross-section. Both the knives and the spikes are mounted in the same manner on square sectioned shafts 2S by means of mufls or sleeves 29 fitting closely over the square shafts and provided with enlarged ends, in each of which is cut a groove 80 of the same shape as the spike or knife which it is intended to carry. The groeve runs preferably to one side of the hole for the shaft 28 and opens at two opposite points of the periphery, the muifs 29 being mounted on the shafts in such a Vmanner that two adjacent spikes or knives cross each other as seen in F ig. 5, one muff carrying one spike and the next muff the other.

The two outermost muffe 31 on each shaft are only about half the length of the inner ones and carry a blade on one side only. A set screw 82 is provided in the short mufs 3l so as to tighten on the muffs with knives and spikes on the respective shafts.

In Fig. 9 is shown a bearing block 33 common for all the shafts, one such bearing block being secured on each side of the frame 15. Each shaft, the ends of which are cylindrical, has its own pair of caps 34, so that it may be removed without disturbing the other shafts. The distance between the bearing blocks 33 is slightly greater than the added length of all the muffs 29, 3l thereon, so that by loosening a set screw 32 any one of the knives or spikes may be taken out for repair or replaced by a new one.

Generally all the shafts are in position during operation of the harrow, but at times it might be advantageous to use it with only the knives, when the spike-carrying shafts may be easily removed by first taking off their caps, or the latter shafts may be retained and the others removed.

As soon the work is completed, the wheels on the harrow are lowered so that Jdie spikes or blades do not touch the ground and the implement may be driven back to tool` house with ease and without an extra wagon as is usual to carry harrows and plows on when brought back and forth from the field of operation.

T"Vhat I claim as'new is l. A mounting for harrow tines comprising a revolving shaft, a plurality of mulfs slidably but non-revolubly mounted on said shaft, means for attaching the muis rigidly together with their adjacent ends contacting, said ends each being provided with a transverse `roove passing to one side of said shaft fgorreceiving and rigidly holding one of said tines.

2'. A mounting for harrow tines comprising a revolving shaft, a plurality of muffs formed with enlarged ends and slidably but non-revolubly mounted on said shaft, means Copies of this patent may be obtained for for attaching the muifs rigidly together with their adjacent ends contacting, said ends each being provided with a transverse groove passing to one side of said shaft and receiving and rigidly holding one of said tines.

3. A mounting for harrow tines comprising a revolving shaft, a plurality of muffs slidably but non-revolubly mounted on said shaft, means for attaching the muffs rigidly together with their adjacent ends contacting, said ends each being provided with a transverse groove passing. to one side of said shaft for receiving and rigidly holding one of said tines, said groove opening at two diametrically opposite points of the periphery of each muff end.

il. A mounting forharrow tines comprisingv a revolving` shaft, a plurality of muffs slidably but non-revolubly mounted on said shaft, means for attaching the mufs rigidly together with their adjacent ends contacting, said ends each being provided with a transverse groove passing to one side of said shaft for receiving and rigidly holding one of said tines, said groove opening at two kdiametrically opposite points of the periphery of each muff end, the muffe having such relative position that the tine in one muff crosses a tine in the adjacent muff.

5. A mounting for barrow tines comprising a revolving shaft, a. plurality of mus slidably but non-revolubly mounted on said shaft, means for attaching the muffs rigidly together with their adjacent'ends contacting, said ends each being provided with a transverse groove .passing to one side of said shaft for receivingand rigidly-holding one of said tines, said means including set screws on the end muffs. Y

In testimony whereof I affix my signature in presence of two witnesses.

FRITZ ERICKSON.

l/Vitnesses: Y

IsAAo REX, GEORGE JOHNSON.

ve cents each, by addressing the Commissioner if Patents,

Washington, D. C. 

